Change defaults if VOMS support is not compiled.
Change defaults if VOMS support is not compiled.

If a VOMS authz is required and CVMFS was compiled without VOMS
support, then deny the file access.

(This also centralizes the authorization checks.)

alhowaidi/cvmfsNDN,djw8605/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,cvmfs/cvmfs,djw8605/cvmfs,trshaffer/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,alhowaidi/cvmfsNDN,reneme/cvmfs,DrDaveD/cvmfs,trshaffer/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,cvmfs/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,reneme/cvmfs,Gangbiao/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,Moliholy/cvmfs,Moliholy/cvmfs,Moliholy/cvmfs,Moliholy/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,djw8605/cvmfs,trshaffer/cvmfs